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Fair Value - Sensitivity Analysis (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Fair Value Disclosures [Abstract]  
Weighted average prepayment speeds, 10% $ (62,497)
Weighted average prepayment speeds, 20% (121,391)
Discount rate (Option-adjusted spread), 10% (63,711)
Discount rate (Option-adjusted spread), 20% $ (114,336)